//使用指向结构的指针
#include<stdio.h>
#include<string.h>
#define NLEN 30
struct namect{
    char fname[NLEN];
    char lname[NLEN];
    int letters;
};
void getinfo(struct namect *);
void makeinfo(struct namect *);
void showinfo(const struct namect *);
char * s_gets(char *st, int n);

int main(void)
{
    struct namect person;

    getinfo(&person);
    makeinfo(&person);
    showinfo(&person);
    return 0;
}

void getinfo(struct namect * pst)
{
    printf("Please enter your first name.\n");
    s_gets(pst->fname, NLEN);
    printf("Please enter your last name.\n");
    s_gets(pst->lname, NLEN);
}

void makeinfo(struct namect * pst)
{
    pst->letters = strlen(pst->fname) + strlen(pst->lname);
}

void showinfo(const struct namect * pst)
{
    printf("%s %s, your name contains %d letters.\n", pst->fname, pst->lname, pst->letters);
}

char * s_gets(char *st, int n)
{
    char * ret_val;
    char * find;

    ret_val = fgets(st, n ,stdin);
    if(ret_val)
    {
        find = strchr(st, '\n');
        if(find)  //如果地址不是NULL
            *find = '\0';
        else
            while(getchar() != '\n')
                continue;
    }
    return ret_val;
}